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From: Sascha Hauer <sha@pengutronix.de>
To: Jules Maselbas <jmaselbas@kalray.eu>
Cc: barebox@lists.infradead.org, Neeraj Pal <neerajpal09@gmail.com>
Subject: Re: [PATCH] fs: Fix link_path_walk to return -ENOENT on empty path
Date: Mon, 3 May 2021 14:45:47 +0200	[thread overview]
Message-ID: <20210503124547.GL19819@pengutronix.de> (raw)
In-Reply-To: <20210417233409.637-1-jmaselbas@kalray.eu>

On Sun, Apr 18, 2021 at 01:34:09AM +0200, Jules Maselbas wrote:
> link_path_walk was returning 0 when passed with an empty path,
> this lead calling code to assume that the struct nameidata nd
> is valid and thus has a `last` field populated, which is not.
> In the end causing a runtime crash.
> 
> This issue can easily be reproduced by running the command:
> cat ""
> 
> Reported-by: Neeraj Pal <neerajpal09@gmail.com>
> Signed-off-by: Jules Maselbas <jmaselbas@kalray.eu>
> ---
>  fs/fs.c | 2 ++
>  1 file changed, 2 insertions(+)

Applied, thanks

Sascha

> 
> diff --git a/fs/fs.c b/fs/fs.c
> index a02332491..6de5a3b59 100644
> --- a/fs/fs.c
> +++ b/fs/fs.c
> @@ -1928,6 +1928,8 @@ static int link_path_walk(const char *name, struct nameidata *nd)
>  	int err;
>  	char separator = '/';
>  
> +	if (!*name)
> +		return -ENOENT;
>  	while (*name=='/')
>  		name++;
>  	if (!*name)
> -- 
> 2.17.1
> 
> 
> 
> _______________________________________________
> barebox mailing list
> barebox@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/barebox
> 

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      reply	other threads:[~2021-05-03 12:47 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-17 23:34 Jules Maselbas
2021-05-03 12:45 ` Sascha Hauer [this message]

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